US4301324A - Glass-ceramic structures and sintered multilayer substrates thereof with circuit patterns of gold, silver or copper - Google Patents
Glass-ceramic structures and sintered multilayer substrates thereof with circuit patterns of gold, silver or copper Download PDFInfo
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- US4301324A US4301324A US05/875,703 US87570378A US4301324A US 4301324 A US4301324 A US 4301324A US 87570378 A US87570378 A US 87570378A US 4301324 A US4301324 A US 4301324A
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- Prior art keywords
- glass
- article
- gold
- silver
- ceramic
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- 239000002241 glass-ceramic Substances 0.000 title claims abstract description 80
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 17
- 229910052802 copper Inorganic materials 0.000 title claims abstract description 17
- 239000010949 copper Substances 0.000 title claims abstract description 17
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 title claims abstract description 16
- 229910052737 gold Inorganic materials 0.000 title claims abstract description 16
- 239000010931 gold Substances 0.000 title claims abstract description 16
- 229910052709 silver Inorganic materials 0.000 title claims abstract description 16
- 239000004332 silver Substances 0.000 title claims abstract description 16
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 title claims abstract description 15
- 239000000758 substrate Substances 0.000 title abstract description 22
- 239000011521 glass Substances 0.000 claims abstract description 70
- 229910052751 metal Inorganic materials 0.000 claims abstract description 14
- 239000002184 metal Substances 0.000 claims abstract description 14
- CNLWCVNCHLKFHK-UHFFFAOYSA-N aluminum;lithium;dioxido(oxo)silane Chemical compound [Li+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O CNLWCVNCHLKFHK-UHFFFAOYSA-N 0.000 claims description 31
- 229910052644 β-spodumene Inorganic materials 0.000 claims description 31
- 239000004020 conductor Substances 0.000 claims description 14
- 239000000919 ceramic Substances 0.000 claims description 8
- PAZHGORSDKKUPI-UHFFFAOYSA-N lithium metasilicate Chemical compound [Li+].[Li+].[O-][Si]([O-])=O PAZHGORSDKKUPI-UHFFFAOYSA-N 0.000 claims description 8
- 229910052912 lithium silicate Inorganic materials 0.000 claims description 8
- 239000004065 semiconductor Substances 0.000 claims description 5
- FKHIFSZMMVMEQY-UHFFFAOYSA-N talc Chemical compound [Mg+2].[O-][Si]([O-])=O FKHIFSZMMVMEQY-UHFFFAOYSA-N 0.000 claims description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 4
- 229910052710 silicon Inorganic materials 0.000 claims description 4
- 239000010703 silicon Substances 0.000 claims description 4
- 238000009826 distribution Methods 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 claims 4
- 239000000956 alloy Substances 0.000 claims 4
- 239000000843 powder Substances 0.000 abstract description 11
- 238000002844 melting Methods 0.000 abstract description 6
- 230000008018 melting Effects 0.000 abstract description 6
- 150000002739 metals Chemical class 0.000 abstract description 4
- 230000007935 neutral effect Effects 0.000 abstract 1
- 238000005245 sintering Methods 0.000 description 57
- 239000000203 mixture Substances 0.000 description 38
- 229910052878 cordierite Inorganic materials 0.000 description 32
- 239000000463 material Substances 0.000 description 27
- 238000000034 method Methods 0.000 description 23
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 description 17
- 239000002245 particle Substances 0.000 description 17
- 238000010899 nucleation Methods 0.000 description 15
- 230000006911 nucleation Effects 0.000 description 15
- 239000011230 binding agent Substances 0.000 description 13
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 12
- 238000002425 crystallisation Methods 0.000 description 12
- 230000008025 crystallization Effects 0.000 description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 10
- 239000013078 crystal Substances 0.000 description 9
- 238000000280 densification Methods 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 9
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 8
- 230000015572 biosynthetic process Effects 0.000 description 8
- 229910018404 Al2 O3 Inorganic materials 0.000 description 7
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 7
- 229910011763 Li2 O Inorganic materials 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 6
- 238000010304 firing Methods 0.000 description 6
- 239000000470 constituent Substances 0.000 description 5
- 238000000227 grinding Methods 0.000 description 5
- 239000000377 silicon dioxide Substances 0.000 description 5
- 229910004554 P2 O5 Inorganic materials 0.000 description 4
- 238000002441 X-ray diffraction Methods 0.000 description 4
- 229910052681 coesite Inorganic materials 0.000 description 4
- 229910052906 cristobalite Inorganic materials 0.000 description 4
- 239000006063 cullet Substances 0.000 description 4
- 238000003475 lamination Methods 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- 229910052682 stishovite Inorganic materials 0.000 description 4
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 4
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 4
- 229910052905 tridymite Inorganic materials 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 238000007792 addition Methods 0.000 description 3
- 238000004581 coalescence Methods 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 238000010030 laminating Methods 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- DOIRQSBPFJWKBE-UHFFFAOYSA-N dibutyl phthalate Chemical compound CCCCOC(=O)C1=CC=CC=C1C(=O)OCCCC DOIRQSBPFJWKBE-UHFFFAOYSA-N 0.000 description 2
- 239000010408 film Substances 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 239000006112 glass ceramic composition Substances 0.000 description 2
- -1 lithium silicates Chemical class 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000002923 metal particle Substances 0.000 description 2
- 238000005191 phase separation Methods 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 239000002243 precursor Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000010345 tape casting Methods 0.000 description 2
- 238000011282 treatment Methods 0.000 description 2
- 229920002554 vinyl polymer Polymers 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 229910011255 B2O3 Inorganic materials 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 229910008556 Li2O—Al2O3—SiO2 Inorganic materials 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 229910004742 Na2 O Inorganic materials 0.000 description 1
- 229910004288 O3.5SiO2 Inorganic materials 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 description 1
- 238000004455 differential thermal analysis Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- WVMPCBWWBLZKPD-UHFFFAOYSA-N dilithium oxido-[oxido(oxo)silyl]oxy-oxosilane Chemical compound [Li+].[Li+].[O-][Si](=O)O[Si]([O-])=O WVMPCBWWBLZKPD-UHFFFAOYSA-N 0.000 description 1
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 1
- 238000009837 dry grinding Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 238000005816 glass manufacturing process Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000000976 ink Substances 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 239000000391 magnesium silicate Substances 0.000 description 1
- 235000012243 magnesium silicates Nutrition 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000006060 molten glass Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910052863 mullite Inorganic materials 0.000 description 1
- 239000002667 nucleating agent Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 238000013001 point bending Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920002689 polyvinyl acetate Polymers 0.000 description 1
- 239000011118 polyvinyl acetate Substances 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- CHWRSCGUEQEHOH-UHFFFAOYSA-N potassium oxide Chemical class [O-2].[K+].[K+] CHWRSCGUEQEHOH-UHFFFAOYSA-N 0.000 description 1
- 229910001950 potassium oxide Inorganic materials 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000006064 precursor glass Substances 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000011214 refractory ceramic Substances 0.000 description 1
- 239000003870 refractory metal Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000000518 rheometry Methods 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000007573 shrinkage measurement Methods 0.000 description 1
- 229910001948 sodium oxide Inorganic materials 0.000 description 1
- 238000001757 thermogravimetry curve Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000001238 wet grinding Methods 0.000 description 1
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/16—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay
- C04B35/18—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay rich in aluminium oxide
- C04B35/19—Alkali metal aluminosilicates, e.g. spodumene
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C10/00—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition
- C03C10/0009—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition containing silica as main constituent
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C10/00—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition
- C03C10/0018—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition containing SiO2, Al2O3 and monovalent metal oxide as main constituents
- C03C10/0027—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition containing SiO2, Al2O3 and monovalent metal oxide as main constituents containing SiO2, Al2O3, Li2O as main constituents
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C10/00—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition
- C03C10/0036—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition containing SiO2, Al2O3 and a divalent metal oxide as main constituents
- C03C10/0045—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition containing SiO2, Al2O3 and a divalent metal oxide as main constituents containing SiO2, Al2O3 and MgO as main constituents
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/16—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay
- C04B35/18—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay rich in aluminium oxide
- C04B35/195—Alkaline earth aluminosilicates, e.g. cordierite or anorthite
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/62605—Treating the starting powders individually or as mixtures
- C04B35/6261—Milling
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/48—Manufacture or treatment of parts, e.g. containers, prior to assembly of the devices, using processes not provided for in a single one of the groups H01L21/18 - H01L21/326 or H10D48/04 - H10D48/07
- H01L21/4803—Insulating or insulated parts, e.g. mountings, containers, diamond heatsinks
- H01L21/4807—Ceramic parts
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/12—Mountings, e.g. non-detachable insulating substrates
- H01L23/14—Mountings, e.g. non-detachable insulating substrates characterised by the material or its electrical properties
- H01L23/15—Ceramic or glass substrates
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
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- C04B2235/3201—Alkali metal oxides or oxide-forming salts thereof
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
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- C04B2235/3201—Alkali metal oxides or oxide-forming salts thereof
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3206—Magnesium oxides or oxide-forming salts thereof
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- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3208—Calcium oxide or oxide-forming salts thereof, e.g. lime
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Definitions
- This invention relates to glass-ceramic structures and, more particularly, to thick or thin film or hybrid, inter-connected multilayer substrates made of sintered glass-ceramic insulator and conducting patterns made of thick film gold, silver or copper (for electronic devices). Also, this invention relates to the process and materials for producing such substrates starting with certain glass powders and conductor "inks” or “pastes” containing finely divided powders of gold, silver or copper by the so-called “laminated green sheet” technique at firing temperatures not exceeding the melting points of the conductor metal employed.
- the substrates may be designed with termination pads for attaching semiconductor chips, connector leads, capacitors, resistors, covers, etc. Interconnections between buried conductor layers can be achieved through the so-called “vias” formed by metal-paste-filled holes in the individual layers formed prior to lamination which upon sintering will become densely sintered metal interconnections.
- Alumina Al 2 O 3
- thermal conductivity thermal conductivity
- stability and strength is generally the material of choice for substrate fabrication.
- K the relatively high dielectric constant, hereinafter designated by the letter "K"
- K Al 2 O 3 ⁇ 10 entails significant signal propogation delays and noise.
- aluminas ⁇ 1600° C.
- co-sinterable conducting metallurgies to refractory metals such as tungsten, molybdenum, platinum, palladium or combinations of these with each other or with certain other metals and precludes the sole use of good electrical conductors such as gold, silver, or copper because these latter will be molten much before the sintering temperature of alumina is reached.
- a further disadvantage of alumina is its relatively high thermal expansion coefficient ( ⁇ 65-70 ⁇ 10 -7 /°C.) compared to that of silicon semiconductor chips ( ⁇ 35 ⁇ 10 -7 /°C.) which may, in certain cases, result in some design and reliability concerns.
- glass-ceramics are obtained through the controlled, in-situ, crystallization of a glass body of proper composition brought about by a two-step heat treatment procedure.
- the glass composition generally includes substances called nucleating agents examples of which are TiO 2 , ZrO 2 , P 2 O 5 , SnO 2 and certain colloidal metal particles.
- the resultant body is composed of a multitude of fine grained crystals of substantially uniform size homogeneously dispersed in a glassy matrix, the crystal phase constituting the major portion of the body.
- the high degree of crystallinity, their very small dimensions and the absence of porosity make these glass-ceramics generally superior in strength to the precursor glasses and other properties such as thermal expansivity, chemical durability etc. closely resemble those of the crystalline phase formed.
- glass-ceramic bodies made in accordance with the above or similar methods wherein a glass article shaped by conventional glass making techniques such as drawing, pressing, blowing etc. of hot, plastic glass mass followed by conversion to the glass-ceramic state by suitable heat treatments will be, hereinafter, referred to as "bulk-crystallized” or simply as “bulk” glass-ceramics to distinguish them from the sintered glass-ceramics of this invention.
- U.S. Pat. No. 3,825,468 refers to sintered glass-ceramic bodies which are porous in the interior and non-porous in the exterior surfaces. Such bodies would have low rupture strengths due mainly to the internal porosity, with typical flexural strengths of less than 10,000 psi. Furthermore, the final sintering temperatures for these glass-ceramics would be well in excess of 1000° C. and hence above the melting points of gold, silver and copper. Another example is U.S. Pat. No.
- Numerous glass compositions allow sintering to dense bodies at temperatures below 1000° C. but are unsuitable for the purposes of this invention owing to the fact the relatively high fluidity (viscosity of 10 5 to 10 8 poises) at the sintering temperature would result in excessive movement of the buried conductor patterns and otherwise prevent the attainment of the rigid tolerances for dimensions and distortion that have to be met.
- the rupture strengths of glasses, typically above 10,000 psi, are also much lower than desired for this application.
- the glasses of the compositions described herein undergo crystallization during the sintering heat treatment forming pervasive rigid networks of micron-sized crystallites which drastically reduces the overall fluidity of the body thereby enabling greater dimensional and distortional control.
- the primary object of this invention is to provide glass-ceramic bodies, having low dielectric constants and other useful properties for substrate applications, which can be easily obtained by the sintering of certain glass powders and concurrent conversion into glass-ceramics at lower temperatures than similar materials known from prior art.
- Another object is to provide materials of lower dielectric constant than prior inorganic materials used in multilayer substrate applications.
- a further object is to provide new glass-ceramic compositions suitable for the production of such bodies which are characterized as essentially non-porous and which possess microstructures consisting of networks of fine crystallites with the residual glass and secondary crystallites occupying the interstitial spaces of such networks.
- This unique microstructure imparts to these glass-ceramics rupture strengths substantially higher than in sintered glass-ceramics known from prior art.
- Another object is to provide multilayer glass-ceramic substrates which are compatible with thick film circuitry of gold, silver or copper and co-fireable therewith.
- Another object is to provide multilayer substrates having thermal expansion coefficients closely matched to that of silicon semiconductor chips.
- Yet another objective is to provide a method for fabricating multilayer substrates of glass-ceramics with conductor patterns of gold, silver or copper.
- the invention embodies among its features a method of making the body by the said method, new compositions for making the body by the said method, an article comprising the body and a method of making the article, hereinafter referred to as a "multilayer glass-ceramic substrate.
- FIG. 1 shows typical dilatometric shrinkage curves of ⁇ -spodumene glass ceramics of this invention.
- FIG. 2 is a photomicrograph of a sintered ⁇ -spodumene glass ceramic of this invention, by scanning electron microscope (SEM) 1000X.
- FIG. 3 shows typical dilatometric shrinkage curves for cordierite glass-ceramics of this invention.
- FIG. 4 is a typical photomicrograph of a sintered ⁇ -cordierite glass-ceramic of this invention (SEM 2000X).
- glass-ceramics of this invention Of the two types of glass-ceramics of this invention, one has ⁇ -spodumene, Li 2 O.Al 2 O 3 .4SiO 2 as the principal crystalline phase while the other has cordierite, 2MgO.2Al 2 O 3 .5SiO 2 , as the main crystalline phase.
- the common feature of these sintered glass-ceramics apart from their excellent sinterability below 1000° C., is a microstructure that can be described as composed of networks that are highly crystalline, the interstices of which are occupied by small amounts of the residual glass and some discrete secondary crystallites.
- microstructures differ from those observed in "bulk” glass-ceramics in that in the latter the glassy phase forms the matrix or the network with discrete crystallites dispersed in it.
- SiO 2 and Al 2 O 3 contents greater than the upper limits given in Table I would not allow satisfactory sintering to be achieved.
- the Li 2 O content should not fall below seven percent except when either B 2 O 3 and F act as fluxes and therefore facilitate sintering; they have the added advantage of assisting melting and refining of the glasses.
- the sodium and potassium oxides are essential constituents since they promote the formation of binary lithium silicates, particularly the metasilicate as a minor crystalline phase which, as discussed below, plays a major role in the sintering process.
- the SiO 2 and Al 2 O 3 contents must also fall within the specified ranges to ensure the development of the desired volume fraction of ⁇ -spodumene to enable the correct thermal expansion coefficient to be attained as well as to ensure high strength.
- the P 2 O 5 and TiO 2 are desirably included to promote internal nucleation of the glass grains; inclusion of ZrO 2 also assists internal nucleation.
- the modulus of rupture of the sintered glass-ceramics was measured in a 3-point bending mode on bar specimens and in general the mean of ten (10) determinations was calculated. Thermal expansion coefficients were measured in the range from room temperature to 300° C. using two-point method. Dielectric constants were determined at a frequency of 1 MHZ at 25° C.
- Typical values of these properties are quoted in Table II.
- the sintering temperatures given are those yielding optimum results but it should be understood that for each material, a sintering range exists usually extending 20° C. above and below the optimum temperature.
- the optimum holding time at the sintering temperature was two hours, though times ranging from one to five hours also give satisfactory results.
- glasses #1, #4, #5, and #7 yielded glass-ceramics having properties suitable for the present multilayer substrate application.
- Compositions #3 and #6 failed to sinter satisfactorily below 1000° C. and composition #2, while it yielded a high strength material, resulted in a glass-ceramic of thermal expansion coefficient outside the desired range.
- glass ceramics #1, #4 and #5 contained ⁇ -spodumene as the major phase and a lithium meta and disilicates as minor phases.
- Composition #2 contained only a very small amount of ⁇ -spodumene plus a major amount of an unidentified crystal phase.
- Composition #3 contained ⁇ -spodumene as the major phase along with minor amounts of lithium metasilicate and disilicate.
- ⁇ -spodumene should be present as a major phase to enable the desired thermal expansion coefficient to be obtained but that binary lithium silicates must also be present as minor phases to promote sintering and densification of the glass-ceramics at temperatures below 1000° C.
- Dilatometric shrinkage measurements of green laminates as a function temperature illustrate very well the differences between those materials containing lithium metasilicate as a minor phase and those that do not contain this phase.
- Curve A FIG. 1 is typical of the former type (e.g. composition 190 1) and Curve B, FIG. 1 of the latter type of material (e.g. glasses #2 and #6).
- the satisfactory material (Curve A) densification commences at a temperature of about 580° C. At this stage, the material is still uncrystallized glass. At a temperature of about 610° C., however, further densification is arrested owing to the onset of crystallization.
- a second densification stage commences at about 910° C. and this proceeds until the glass-ceramic becomes non-porous.
- the second densification stage is absent at temperatures below 1000° C.
- the microstructure of the glass-ceramics obtained from such a sintering mechanism consists of cosintered ⁇ -spodumene crystals forming rigid skeletal structures with the residual glass occupying the interstitial regions in such a structure.
- FIG. 2 is an example of such a microstructure which more resembles those of conventional ceramics obtained by sintering ceramic powders, such as alumina with minor glass additions than those of "bulk" glass-ceramics.
- the absence of a continuous glassy matrix or network is believed to be the principal factor governing the high flexural strengths of the present materials.
- ⁇ -spodumene glass is defined as and restricted to (1) a precursor for ⁇ -spodumene glass ceramic and (2) formed from a batch consisting of, by weight:
- ⁇ -spodumene glass ceramic is defined as and restricted to a glass ceramic structure coalesced and crystallized from “ ⁇ -spodumene glasses” into an article having a microstructure of a pervasive continuous network of 2 to 5 ⁇ m crystallites of ⁇ -spodumene with the interstices of said network occupied by residual glass having dispersed therein discrete secondary 1 to 2 ⁇ m crystallites of lithium metasilicate.
- composition limits are set on the one hand by the need to ensure that cordierite appears as the major crystalline phase in order to achieve desired thermal expansion coefficients and on the other to facilitate sintering below 1000° C. Reduction of MgO and Al 2 O 3 contents below the specified limits is not permissible for this reason. Excessively high Al 2 O 3 and SiO 2 contents would result in materials not capable of sintering below 1000° C. MgO contents higher than the specified maximum could result in the formation of magnesium silicates in significant amounts causing the thermal expansion coefficients to be higher than desired.
- the minor constituents are included to perform important functions.
- the P 2 O 5 , ZrO 2 , TiO 2 and SnO 2 are added to promote nucleation and to regulate the microstructural development.
- the Li 2 O and B 2 O 3 are included as sintering aids; they also serve to regulate the nature of the crystalline phase formed. Cordierite can appear in either the ⁇ or ⁇ form. Sometimes, mixtures of the two appear in the same glass-ceramic. As will become clear in what follows, it has been discovered that in order to produce glass-ceramics having stable thermal expansion coefficients in the desired range as well as lower dielectric constants, it is necessary to develop the cordierite phase predominantly in the ⁇ form.
- the method of glass preparation, grinding and green body preparation are similar to that given for the ⁇ -spodumene compositions.
- the average particle size for the glass powder should be in the range of 2 to 7 ⁇ m for good sintering and strength.
- Table III gives the optimum sintering temperatures for the cordierite ceramics. It has also been discovered, however, that satisfactory materials can be produced at sintering temperatures spanning 80°-100° C. covered by the exothermic peak in the thermograms of the corresponding glasses. For example, composition #10 can be satisfactorily sintered at temperatures within the range of 870° C. to 950° C. and the variation of the thermal expansion coefficient for materials sintered within this range is only ⁇ 1 ⁇ 10 7 /°C.
- composition #8 forms ⁇ -cordierite as a major phase, together with minor amounts of ⁇ -cordierite.
- Composition #9 contains ⁇ -cordierite as the only crystalline phase. The formation of ⁇ -cordierite confers to the glass-ceramic a somewhat higher thermal expansion coefficient as well as an apparent higher dielectric constants. It is evident that the minor constituent Li 2 O catalyses the formation of ⁇ -form of cordierite.
- Composition #10 contains only ⁇ -cordierite due, it is believed, to the presence of boric oxide in the glass composition.
- Composition #11 contains ⁇ -cordierite as the major phase along with some ⁇ -cordierite. Although the thermal expansion coefficient of this material for the sintering temperature of 925° C. falls within the desired range of 20 to 50 ⁇ 10 7 /°C., we have noted that the thermal expansion coefficient is dependent on the sintering temperature employed. Material sintered at 970° C. has an expansion coefficient of 36.4 ⁇ 10 7 /°C. and that sintered at 990° C. has the value of 40 ⁇ 10 7 /°C. The enhanced strength for composition #11 is thought to result from improved crystal nucleation promoted by the inclusion of ZrO 2 . This nucleant, however, also promotes the formation of the ⁇ -cordierite phase if its concentration is above a critical limit.
- composition #12 containing lower concentrations of B 2 O 3 and ZrO 2 compared to composition #11, develops ⁇ -cordierite as the major crystal phase together with clinoenstatite as a minor phase.
- the thermal expansion coefficient of this material is stable over a wide sintering temperature range. For sintering temperatures between 915° C. and 970° C., the expansion coefficient only varied for 23 ⁇ 10 7 /°C. to 24 ⁇ 10 7 /°C.
- the high strength of composition #12 is attributed on the basis of microscopic and x-ray diffraction studies to a high volume fraction of the crystalline phase which occurs as a crystalline network having a very small domain size. The formation of clinoenstatite minor phase in the residual glass during sintering is also likely to have contributed to the high flexural strength of this material.
- FIG. 3 shows typical shrinkage curves for a material that sinters to zero porosity below 1000° C. (Curve A, e.g. composition #10, Table III) and for a material that does not undergo complete densification below 1000° C. (Curve B, e.g. composition #8).
- Curve A e.g. composition #10, Table III
- Curve B e.g. composition #8
- the cordierite materials undergo sintering in a single stage.
- the densification involves predominantly glass-to-glass coalescence.
- composition #10 can be sintered to negligible porosity at a temperature of 850° C. but examination of the material fired to this temperature shows very little crystallinity in it.
- the critical factors that enable the distortion-free sintering to near theoretical densities of these glass-ceramics are the following: (i) the absence of a well-defined nucleation hold on the way to the sintering temperature which prevents internal nucleation and of crystallization prior to the completion of glass-to-glass sintering, (ii) the relative ease of surface nucleation compared to bulk nucleation in these glasses, such nucleation occurring despite the factor (i) above prior to glass-to-glass sintering, (ii) a clear separation between the surface nucleation and crystallization temperatures allowing the glass densification to take place to completion at temperatures in between, (iv) the onset of surface crystallization following soon after the completion of densification providing a crystallized network that prevents further viscous deformation.
- the sintered glass-ceramics can be said to have a two-level microstructure, a cellular network of crystals on the scale of the prior glass particle dimensions (2-5 ⁇ m), forming the first level within which are formed discrete crystals of sub-micron to 1-2 ⁇ m size dispersed in the residual glassy phase
- a typical microstructure is shown in FIG. 4. This unique dual microstructure is believed responsible for the high flexural strength of these sintered glass-ceramics.
- Li 2 O or B 2 O 3 it is possible to control the form of cordierite that is formed and thus to control the thermal expansion coefficient and dielectric constant within certain limits.
- the glass-ceramic of the ⁇ -spodumene type as well as of the cordierite type described above can be used for other applications besides the multilayer substrates. Such applications could be based on one or more of their properties such as their easy sinterability, low thermal expansion coefficients, low dielectric constant and high flexural strength. While some of these compositions cannot be bulk crystallized, other such as composition #1 of Table II can be used in this condition.
- alpha-cordierite glass is defined as and limited to (1) a precursor for "alpha-cordierite glass ceramics”, and (2) formed from a batch consisting of, by weight
- alpha-cordierite glass ceramic is defined as and limited to a glass ceramic structure coalesced and crystallized from “alpha-cordierite glasses” to an article having a microstructure of a pervasive network of 2 to 5 ⁇ m crystallites of alpha-cordierite and clinoenstatite within the interstices of the network occupied by residual glass having dispersed therein discrete secondary 1 to 2 ⁇ m crystallites of clinoenstatite and additional cordierite phase.
- the glasses of the ⁇ -spodumene type and the cordierite type described previously can be used to fabricate multilayer glass-ceramic substrates containing co-sintered conductor patterns of gold, silver or copper.
- the substrate fabrication involves the following steps:
- the cullet of the chosen glass is ground to average particle sizes in the range of 2 to 7 ⁇ m.
- the grinding can be done in two stages--a preliminary dry or wet grinding to--400 mesh particle size followed by further grinding with suitable organic binders and solvents until the average particle size is reduced to lie between 2 to 7 ⁇ m and a castable slurry or slip is obtained.
- a single stage prolonged grinding of cullet in the medium of the binder and solvent until the desired particle size is obtained can also be used. In the latter case, a filtering step may be needed to remove oversized particles.
- a suitable binder is poly-vinyl butaryl resin with a plasticizer such as dioctophthalate or dibutyl phthalate.
- polymers are polyvinyl formal, polyvinyl chloride, polyvinyl acetate or certain acrylic resins.
- an easily evaporable solvent such as methanol is (i) to initially dissolve the binder so as to enable it to coat the individual glass particles, and (ii) to adjust the rheology of the slip or slurry for good castability.
- the slip or slurry prepared as in Step 1 is cast, in accordance with conventional techniques, into thin green sheets preferably by a doctor-blading technique.
- the cast sheets are blanked to the required dimensions in a blanking tool and via holes are punched in them in the required configuration.
- Metallizing paste of gold, silver or copper is extruded into the via holes in the individual sheets by screen printing method.
- the required conductor patterns are screen printed onto the individual green sheets of Step 4.
- a plurality of sheets prepared as in Step 5 are laminated together in registry in a laminating press.
- the temperature and pressure employed for lamination should be such as to cause (i) the individual green sheets to bond to each other to yield a monolithic green substrate, (ii) to cause the green ceramic to sufficiently flow and enclose the conductor patterns.
- the particular glass-ceramic composition chosen should be one that has an optimum sintering temperature between 50°-150° C. below the melting point of the conductor metal employed.
- the organic binders begin to come off at 300° C. and the binder removal is essentially complete before appreciable glass-to-glass sintering has occurred.
- the sintering proceeds according to the mechanism previously outlined and results in the conversion of glass to glass ceramic state in which the crystalline phases formed occupy greater than 80% of the body by volume.
- the holding time at the sintering temperature can vary from 1 to 5 hours.
- the body is then cooled at a conrolled rate not to exceed 4° C./minute to at least about 400° C. after which faster cooling rates may be used.
- organic binders employed for green sheet fabrication should be capable of being evaporated off in such atmospheres at reasonable temperatures.
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Priority Applications (16)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US05/875,703 US4301324A (en) | 1978-02-06 | 1978-02-06 | Glass-ceramic structures and sintered multilayer substrates thereof with circuit patterns of gold, silver or copper |
CA314,417A CA1109664A (en) | 1978-02-06 | 1978-10-26 | Glass-ceramic structures and sintered multilayer substrates thereof with circuit patterns of gold, silver or copper |
FR7837093A FR2416203A1 (fr) | 1978-02-06 | 1978-12-28 | Substrats verre-ceramique et leur procede de fabrication |
BE192779A BE873329A (fr) | 1978-02-06 | 1979-01-05 | Substrats verre-ceramique et leur procede de fabrication |
DE2901172A DE2901172C3 (de) | 1978-02-06 | 1979-01-13 | Verfahren zum Herstellen einer porenfreien Sinterglaskeramik auf der Basis SiO↓2↓-Al↓2↓O↓3↓- (MgO-CaO-BaO-B↓2↓O↓3↓) und daraus hergestelltes Substrat bzw. Laminat |
AT0028979A AT377966B (de) | 1978-02-06 | 1979-01-15 | Mehrschichtiges, gesintertes glaskeramiksubstrat mit aus gold, silber oder kupfer bestehenden leitungsmustern und verfahren zu dessen herstellung |
CH38779A CH645602A5 (de) | 1978-02-06 | 1979-01-16 | Verfahren zum herstellen von gegenstaenden aus glaskeramik und nach diesem verfahren hergestellte gegenstaende. |
GB7901661A GB2013650B (en) | 1978-02-06 | 1979-01-17 | Glass ceramic structures |
JP404879A JPS54111517A (en) | 1978-02-06 | 1979-01-19 | Nonporous glasssceramic body |
SE7900880A SE444308B (sv) | 1978-02-06 | 1979-02-01 | Metod for framstellning av en porfri sinterglaskeramik samt enligt metoden framstellt alster |
IT19842/79A IT1110275B (it) | 1978-02-06 | 1979-02-02 | Struttura vetro-ceramica per substrati circuitali e relativo processo di fabbricazione |
ES477459A ES477459A1 (es) | 1978-02-06 | 1979-02-05 | Un metodo de producir un articulo vitroceramico. |
NL7900926A NL7900926A (nl) | 1978-02-06 | 1979-02-06 | Glaskeramische constructies en gesinterde laminaten daarvan met ketenpatronen van goud, zilver of koper. |
JP56058703A JPS5946900B2 (ja) | 1978-02-06 | 1981-04-20 | 非多孔質ガラス−セラミツク体 |
CA377,129A CA1122789A (en) | 1978-02-06 | 1981-05-07 | Glass-ceramic structures and sintered multilayer substrates thereof with circuit patterns of gold, silver or copper |
US06/276,236 US4413061A (en) | 1978-02-06 | 1981-06-22 | Glass-ceramic structures and sintered multilayer substrates thereof with circuit patterns of gold, silver or copper |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US05/875,703 US4301324A (en) | 1978-02-06 | 1978-02-06 | Glass-ceramic structures and sintered multilayer substrates thereof with circuit patterns of gold, silver or copper |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US06/276,236 Division US4413061A (en) | 1978-02-06 | 1981-06-22 | Glass-ceramic structures and sintered multilayer substrates thereof with circuit patterns of gold, silver or copper |
Publications (1)
Publication Number | Publication Date |
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US4301324A true US4301324A (en) | 1981-11-17 |
Family
ID=25366225
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US05/875,703 Expired - Lifetime US4301324A (en) | 1978-02-06 | 1978-02-06 | Glass-ceramic structures and sintered multilayer substrates thereof with circuit patterns of gold, silver or copper |
Country Status (13)
Country | Link |
---|---|
US (1) | US4301324A (xx) |
JP (2) | JPS54111517A (xx) |
AT (1) | AT377966B (xx) |
BE (1) | BE873329A (xx) |
CA (1) | CA1109664A (xx) |
CH (1) | CH645602A5 (xx) |
DE (1) | DE2901172C3 (xx) |
ES (1) | ES477459A1 (xx) |
FR (1) | FR2416203A1 (xx) |
GB (1) | GB2013650B (xx) |
IT (1) | IT1110275B (xx) |
NL (1) | NL7900926A (xx) |
SE (1) | SE444308B (xx) |
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Also Published As
Publication number | Publication date |
---|---|
SE444308B (sv) | 1986-04-07 |
DE2901172B2 (de) | 1981-05-07 |
JPS54111517A (en) | 1979-08-31 |
IT1110275B (it) | 1985-12-23 |
IT7919842A0 (it) | 1979-02-02 |
CH645602A5 (de) | 1984-10-15 |
JPS5742577B2 (xx) | 1982-09-09 |
AT377966B (de) | 1985-05-28 |
FR2416203A1 (fr) | 1979-08-31 |
CA1109664A (en) | 1981-09-29 |
JPS5946900B2 (ja) | 1984-11-15 |
ATA28979A (de) | 1984-10-15 |
SE7900880L (sv) | 1979-08-07 |
FR2416203B1 (xx) | 1983-04-15 |
ES477459A1 (es) | 1979-10-16 |
DE2901172C3 (de) | 1982-03-25 |
NL7900926A (nl) | 1979-08-08 |
DE2901172A1 (de) | 1979-08-16 |
JPS5711847A (en) | 1982-01-21 |
GB2013650B (en) | 1982-10-06 |
BE873329A (fr) | 1979-05-02 |
GB2013650A (en) | 1979-08-15 |
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